The "scrumble" camouflage is not that difficult at all. Do a Google search for Halberstadt CL.II profiles. The one by Dave Douglass is the best in my opinion.
The most important tool you will need is an old chisel shaped brush that has seen better days. The chisel brush is flat and square in shape, some have short bristles and others are longer. The short one is the size most preferable. The bristles on an older brush are starting to bend and curl a bit, perfect for dry brushing. A new brush can be used if an old one is not available, just remember the technique described below will be tough on the shape of the brush.
Stippling is the technique I use to apply the camouflage colors. It is similar to dry-brushing accept in one critical way. Instead of drawing the brush across the surface as in painting, you jab the brush into the surface to leave dots and small dashes. It's important to make sure that the majority of paint is wiped off the brush. Paint a test fuselage or scrap sheet in a natural wood color of your preference. Include the amount of grain you wish to portray. You will need to pick the camouflage colors. I use lilac, a medium blue and a green, a light and darker green can be used. Apply the camouflage colors in different locations with minor overlapping using the stippling technique. Throughout the process, the fuselage color should still be visible to some degree. Not to worry if it becomes completely covered in some places, you can stipple the fuselage color on top of the camouflage if that happens.
Give that a shot and see how it turns out.
Good luck
